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These data indicate that extended regions generally exceeding
- 40 pCi/g probably are present on 11 islands,although the shape of the regions
is uncertain because in many instances the distance between two samples hav-
ing more than 40 pCi/g was either relatively large or it included a sample givin
much less than 40 pCi/g. Another uncertainity resulted from the AEC survey
employing more than one sample configuration.
For example, the following concentrations are reported (Reference 2, Vol.
II, Fig. B.15.1.i) for the top
. 15 em of the profile #101 from Lujor (Pearl):
420 pCi/g at 0-2 cm, 115 pCi/g
at 2-5 em, 5 pCi/g at 5-10 cm, and 2.7 pCi/g at 10-15 cm, while the "surface
sample”
#101
(covering the entire 0-15 cm) is given (Reference 2, Vol II,
Fig. B.15.2g) ass ‘pCi/g-
datory cleanup"
The location thus could be listed as either “man-
mease-by-case cleanup."
.
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77
GER
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™ 5. ‘Although the paucity of data and the problems of comparing surface
sample data with profile sample data prevent one from knowing with certainity
the areas or volumes qualifying for Cleanup, the AEC Survey is considered suffi-
cient to permit classifying the northern islands into two kinds of regions-one which probably has soil containing Pu at concentrations greater than 40pCi/
(high concentration) and the other as unlikely to have significant amounts
of Pu at concentrations greater than 40 pCi/g (low concentration).
The high
‘concentration regions are described inEnclosure 3. The low concentration
regions include all of Biken (Leroy),
the two groups of islands (1) Kidrinen
(Lucy), Taiwel (Percy), Bokenelab (Mary) and Elle (Nancy) and (2) Bijire (Tilda)
Lojwa (Ursula), Alembel (Vera) and Billae (Wilma), and the areas outside the
high concentration regions for the other northern islands.
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05
FITS
6. During Cleanup, the high-concentration regions listed in Enclosure 3 will be reinvestigated 3n more detail than was done during the AEC
Survey; e.g. whereas the AEC Survey averaged only about 1 sample per acre for <all northern islands, Cleanup will achieve at least 10 Samples per acre.
The
low concentration regions, although having Pu concentrationrangesgreater than
ole
are typical for the southern islands, do not include samples with Pu concentration in excess of 40 pCi/g. Thus, these areas might be considered as already complying with the AEC Task Group recommendations and not requiring any 76*+
soil Cleanup; however, they will be programmed for reinvestigation at about the
same sample frequency as obtained by the AEC Surveyfor the purpose of confirming the apparent findings of no significant Pu contamination.
If contrary
data.are obtained; i.e. if Pu concentration is found to exceed 40 pci/s at any
spot ina low-concentration region, then that area will be thoroughly investigated.
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